no output device found

really confused to this problem

i just got an old macbook air first generation and there is no sound out from internal speaker or headset.

i have checked to system preferences and i've found in output device there is a dialogue box said no output device found.

and i also have check to the system profiler to the audio section and there is on the dialogue box said

Intel High Definition Audio:

Device ID: 0x106B00A2

Audio ID: 0

please help me, is it a hardware or software problem?

and how do i fix it?

my best regard